There are different types of invertebrates. We can put these into groups depending on their common features, for example, invertebrates with six legs, more than six legs, and without legs. Invertebrates without legs can be further classified into worm-like or not worm-like.
There are six groups of invertebrates:
Mollusks live in marine environments, and they exist in many different shapes and sizes, for example, some have shells for protection and others don’t.
Snails, squid, and oysters are examples of mollusks.
Arthropods live on land, there are many different types of arthropods. Arthropods can have different numbers of jointed legs, some have six, some have eight, some have ten, and others have more than ten jointed legs. Arthropods also have an exoskeleton.
Ants, spiders, crabs, and millipedes are examples of arthropods.
Worms have long soft bodies and moist skin.
Cnidarians are also known as the jellyfish group. These are marine animals that usually have tentacles with stinging cells. They use these to capture food.
Jellyfish and polyps are examples of cnidarians.
Echinoderms are marine animals. They have a star-like shape consisting of a hard, spiny covering or skin.
Starfish is an example of an echinoderm.
Sponges are also known as peripherals. These invertebrates are found in deep water; they have pores and can’t swim.